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5
DEPTH 2100 Installation and Operation Manual
NAVMAN
Keel/Surface Offset
An offset may be automatically added to or subtracted
from the depth reading to compensate for the location
of the transducer. This allows the instrument to
indicate the water depth relative to the bottom of the
keel or the surface of the water.
To set the keel/surface offset:
1. Apply power while holding down .
ON
^
Hold down during power up
2. When the unit is on, release . The display will
indicate if the current offset is keel offset or
waterline offset:
Hull Offset (Depth below the keel)
Surface Offset (Depth below the surface)
3. After 5 seconds the display will indicate the
current offset.
Note: A negative offset is used to display depth
below the keel and a positive offset is used to
display depth below the surface.
8. To exit this mode, press and hold both and
2 Instrument Setup
4. Use and to change the value. If either key
is held depressed for more than one second the
reading will increase or decrease rapidly.
5. The offset can be programmed in 0.1 unit steps
from -9.9 to 9.9 feet (or equivalent). When
programmed for a negative offset, ‘-’ will be
indicated on the left hand side of the display.
6. To display depth below the keel enter the
vertical distance between the bottom of the keel
and the depth transducer as a negative value.
7. To display depth below surface enter the
vertical distance from the waterline to the
depth transducer as a positive number (no
negative sign).
Hold down
during power up
simultaneously. Alternatively, if no keys are
pressed for a period of 5 seconds normal depth
display will resume.
OFFON
^V
Press simultaneously
The display will now indicate the current water
depth.
Transducer Setting
A Transducer Setting is provided to allow the Depth
2100 to be used with different transducer types. The
default setting (= 0.0) is used for most transducers.
Some transducers ‘ring’ after the sonar transmit pulse
(just like hitting a bell). This ringing can be interpreted
as an echo from a shallow bottom. The setting is
used to increase the required level that shallow
echoes must meet before they will be displayed.
If the Depth 2100 gives repeated false readings of
1.5 to 3 feet depth while in deep water the transducer
setting should be increased. Adjust it upward by 0.5
at a time and retest. The range of values is -0.9 to
+2.5. If the value is set too high it could cause erratic
readings in shallow water.
Changing the Transducer Setting:
1. Apply power while holding down . The
display will show either HOF or SOF for 7
seconds. Continue to hold the key down.
2. The display will show tdr.
tdr
3. Release the key.
4. After 2 seconds the display will show the
Transducer Setting value eg 0.0.
5. Use and to change the value.
6. To exit this mode, press and hold both and
simultaneously.
Units of Measure
To select the displayed unit
1. Apply power while holding down .
OFF
V
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